Arno Berg (14 February 1890 – 1 June 1974) was a Swedish born, Norwegian architect and antiquarian. Berg is particularly associated with the preservation of historic building in Oslo.
Berg was born in Gothenburg, Sweden. He was the son of Edvard Berg (1859–1912) and Clarita Krüger (1865–1926). He graduated from the Royal Institute of Technology in in 1914. He worked at the Norwegian Museum of Cultural History in Oslo from 1918 to 1927. From 1927 he was a secretary for the heritage association Selskabet for Oslo Byes Vel, and editor of the periodical St. Hallvard. He was the first head of the department for cultural heritage in Oslo, serving from 1956 to 1960. The preservation of Basarhallene at Oslo Cathedral, buildings in Homansbyen and Karl Johans gate, as well as the restoration of Oslo Ladegård and Akershus Fortress were all focuses of his attention. Among his publications are Selskabet for Oslo Byes Vels historie 1811–1861 from 1936, Vår Frelsers kirke from 1950, and a two-volume work on Akershus Fortress. He was awarded the Medal of St. Hallvard and was decorated Commander of the Order of St. Olav. Arno Bergs plass in Oslo was named in his honor. A bust of Berg was unveiled at Oslo Ladegård in 1972.